19618557950 has 24 divisors (see below), whose sum is σ = 36521370072. Its totient is φ = 7840788320.

The previous prime is 19618557949. The next prime is 19618557953. The reversal of 19618557950 is 5975581691.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19618557953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105929 + ... + 224628.

It is an arithmetic number, because the mean of its divisors is an integer number (1521723753).

Almost surely, 2^19618557950 is an apocalyptic number.

19618557950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19618557950 is a deficient number, since it is larger than the sum of its proper divisors (16902812122).

19618557950 is a wasteful number, since it uses less digits than its factorization.

19618557950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331756 (or 331751 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 56.

The spelling of 19618557950 in words is "nineteen billion, six hundred eighteen million, five hundred fifty-seven thousand, nine hundred fifty".